<header ui-view="header" ng-class="{true: all_class.header.bg[current_class]}[true]" class="header header-md navbar navbar-fixed-top-xs"></header>
<section>
    <section class="hbox stretch">
        <aside ui-view="nav" id="nav" ng-class="{true: all_class.nav[current_class]}[true]" class="nav-xs aside hidden-print"></aside>
        <section class="vbox">
            <section id="content" ui-view=""></section>
            <footer class="footer" ng-class="{true: all_class.music_player[current_class]}[true]" ui-view="music_player"></footer>
        </section>
    </section>
</section>